/Engine/Plugins/Runtime/MeshModelingToolset/Source/ModelingComponentsEditorOnly/Public/ToolTargets/StaticMeshToolTarget.h
For providers that have LODs (i.e. if SupportsLODs returns true), returns the LOD that GetMeshDescription/etc will return. Otherwise, returns Default LOD.
virtual EMeshLODIdentifier GetMeshDescriptionLOD() const